Condenser



Dec. 1925.

H. s; DODSON AL' CONDENSER Filed July 26,1922

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Patented Dec. 15, 1925.

UNITED STATES PATENT OFFIQE.

HAROLD SCOTT DODSON AND WILLIAM H. SEIREY, OF DETROIT, MICHIGAN.

CONDENSER.

Application filed July 26, 1922. Serial No. 577,541.

To all whom it may concern.-

Be it known that we, HAROLD Soo'r'r Don- SON and i/VILLIAM H. SHIREY, citizens of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Condensers, of which the following is a specification, reference being had therein to the accompanying drawings. I

This invention relates to condensers that may be advantageously used as part of a wireless receiving apparatus so that electrical energy may be stored to serve a receiving The primary object of our invention is to provide a variable condenser wherein the dielectric area of the device is varied in. contradistinction to the usual and well known variations in plate areas.

Another object of this invention is to provide a variable condenser having adj ustable conical members that may be easily and quickly shifted, one relative to the other for an approximate adjustment and then manipulated for a minute adjustment, thus permitting of a capacity of the condenser being regulated to a desired degree.

A further object of our invention is to so provide a condenser of the dry type in which a liquid or semi-solid medium may be placed to increase the capacity of the condenser.

A still further object of our invention is to provide a condenser that may be easily and quickly assembled upon an instrument board or other support and the parts are made with a view of reducing the cost of manufacture and at the same time retain those features by which durability, accessibility and compactness are secured.

The above are a few of the objects attained by our invention and others will a 31363.1 as the construction is better understood. Reference will now be had to the drawings, where- Figure 1 is a longitudinal sectional view of the condenser;

Fig. 2 is a side elevation of a portion of 5 the same;

Fig. 3 is a front elevation of the con denser;

Fig. 4 is a cross sectional view taken on the line l% of Fig. 1, and

Fig. 5 shows detail views of a portion of a reciprocable member forming part of our device.

In the drawing, the reference numeral 1 denotes a tubular exteriorly screwthreaded coupling member which has one end. thereof reduced so that an insulator 2 may be mountod thereon and lixed on'the coupling member by peening or otherwise upsetting the end of the member, as at 3. The opposite end of the coupling member has an end wall at provided with a transverse slot 5.

6 denotes an instrument board or suitable support provided with an opening 7 through which the coupling member may extend and screwed on said coupling member a jam nut 8 engaging one face of the instrument board 6 and screwed on the end of said member is a cam member 9, this member engaging the other face of the instrument board and cooperating with the nut 8 in holding the coupling member relative to said instrument board. The cam member 9 has an annular outstanding wall 10 cut away at one side of said cam member to provide a cam surface 11 and opposed to this cam surface a segment shaped cam 12 carried by said cam member. The cam member 9 has been illustrated as screwed on the coupling member l, but it may be loose relative to said coupling member and held in place by a nut 13 screwed on the coupling member with the cam member 9 sandwiched between the nut 13 and the instrument board 6.

1% denotes a primary adjusting member set in the cam member 9 over the nut 13, said primary adjusting member having a long crank 15 engaging the cam surface 11 with the outer end of said long crank provided with a handle or knob 16. Diametrically opposite the long crank 15 is a short crank 17 engaging the cam 12. iVith the cam 12 having an inclination the reverse of the cam surface 11 the long and short cranks 15 and 17 will properly balance the primary ad justing member 1%. This member has a concentric opening through which loosely extends a reciprocable member 18, preferably in the form of a bolt and on the outer end of said reciprocating member is a nut 19 on which is mounted asectional knob or secondary adjusting member 20, between the sections of which is mounted a finger or indicator 21 that may be swung about a graduated dial or cover 22 suitably mounted on and closing a cam member 9. The dial 22 has a concentric opening providing clearance for the secondary adjusting member and said dial has two sets of graduations .or calibrations 23 and 24, the former serving the finger or indicator 21- and the latter serving the long crank 15. The secondary adjusting member 20 is retained. on the nut 19 by a screw 25 countersunk in the member 20 and mounted in the nut 19.

26 denotes a'nut screwed on the coupling member 1 adjacent the jam nut 8 and contacting with the' nut 26 is a terminal member 27 having abinding post 28. The terminal member is held against thenut 26 by an 1nsulator 29 screwed on the coupling member 1 and against the insulator 29 is another terminal member 30 having a-binding post 81.

32 denotes an'outer conical shaped condenser member which has its small end terminating in a sleeve 33 provided with an inturned flange 34, said flange being sandwiched between the insulator 2 and the terminal member 30, so'that the outer condenser member is co-axial of the coupling member 1. The nut 26 permits of the ter minal members and the outer condenser member being properly assembled on the coupling 'member prior to mounting said coupling member in the instrument board 6. The large end of the condenser member 32 is closed by a cap or end wall 35.

36 denotes a tubular support slidable in the coupling member 1 and mounted on the reciprocating member 18. The tubular support 36 abuts a head 37 of the reciprocating member18 and in said tubular support is a coiled expansion spring 38 abutting one end of the tubular support and engaging a transverse pin 39 mounted in the reciprocatin-g member 18 with its ends extending into the transverse slot 5 of the coupling member, so that the reciprocating member 18 is held against rotation, relative to the coupling member, but may be reciprocated in said coupling member by manipulating either the primary or secondary adjusting member.

Mounted on the end of the tubular support 36 is an inner conical shaped condenser member 10 which has its walls disposed in parallelism and spaced relation to the walls of the outer condenser membe'rso as to provide a conical shaped dielectric area or-gap, which may be increased or decreased by moving the inner condenser member 40 to and from the outer condenser member 32. It is now apparent that the inner condenser member is enclosed in a chamber in which oil, grease or any other medium may be placed for increasing the capacity of the condenser.

Considering the condenser in its dry form it has been shown at its least capacity with the primary adjustin'g'member at its lowest point. This primary adjusting member permits of an approximate adjustment being'made which is brought about by the long crank 15 riding up the cam surface 11 thereby bodily forcing-the primary adjusting member 14, the nut 19, the secondary adjusting member 20 and the reciprocating member 18 outwardly from the instrument board 6" to move the inner condenser member 40 closer to the outer condensing member 32, thus reducing the dielectric area between said condenser members. After this approximate adjustment, the secondary adjusting member 20 may be manipulated andby virtue of the fine screwthreaded engagement between the nut 19 andthe reciprocating member 18, said reciprocating membermay be minutely shifted to properly place the inner condenser member relative to the outer condenser member.

It is thought that the operation and utility of our device will be apparent without further description, and while in the drawing there is illustrated a preferred embodiment of our invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims.

What we claim is z- 1; A condenser comprising inner and outer condensermembers with the inner condenser'member arranged to be adjusted relative to the outer condenser member, are-- ciprocatory member coaxially ofthe inner condenser member, a tubular member on said reciprocatory member supporting said inner condenser member, a cam surface adjacent said reciprocatory member, a lever articulated with said reciprocatory member and adapted to bear on said cam surface and cause reciprocation of said reciprocatory member and coarse adjustment of said inner condenser member relative to said outer condenser member, and a secondary adjusting member supported adjacent's'aid lever and adapted by rotation tocause a fine adjustment of said reciprocatory memher and said inner condenser member-relative to said outer condenser member.

2. A condenser as called for in claim 1, and a spring in said tubular member about said reciprocatory member establishing frictional engagement between said membersso that said secondary adjusting member may impart movement to said inner condenser member by rotation.

3. A condenser comprising inner and outer condenser members with the inner member arranged to be adjusted relative to the outer member, a reciprocatory member coaxially of said inner member and articulated therewith for adjusting said inner member, a cam surface adjacent said recip- 10 rocatory member, a lever supported from said reciprocatory member and operatable against said cam surface for shifting said reciprocatory member and said inner condenser member, and means inclosing said reciprocatory member and supporting said outer condenser member.

In testimony whereof We aflix our signatures.

HAROLD SCOTT DODSON. WVILLIAM H. SI-IIREY. 

